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2 | |
2 | |
3 | EV - perl interface to libev, a high performance full-featured event loop |
3 | EV - perl interface to libev, a high performance full-featured event loop |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use EV; |
7 | use EV; |
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8 | |
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9 | # TIMERS |
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10 | |
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11 | my $w = EV::timer 2, 0, sub { |
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12 | warn "is called after 2s"; |
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13 | }; |
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14 | |
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15 | my $w = EV::timer 2, 2, sub { |
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16 | warn "is called roughly every 2s (repeat = 2)"; |
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17 | }; |
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18 | |
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19 | undef $w; # destroy event watcher again |
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20 | |
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21 | my $w = EV::periodic 0, 60, 0, sub { |
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22 | warn "is called every minute, on the minute, exactly"; |
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23 | }; |
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24 | |
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25 | # IO |
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26 | |
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27 | my $w = EV::io *STDIN, EV::READ, sub { |
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28 | my ($w, $revents) = @_; # all callbacks receive the watcher and event mask |
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29 | warn "stdin is readable, you entered: ", <STDIN>; |
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30 | }; |
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31 | |
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32 | # SIGNALS |
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33 | |
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34 | my $w = EV::signal 'QUIT', sub { |
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35 | warn "sigquit received\n"; |
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36 | }; |
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37 | |
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38 | # CHILD/PID STATUS CHANGES |
8 | |
39 | |
9 | # TIMERS |
40 | my $w = EV::child 666, 0, sub { |
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41 | my ($w, $revents) = @_; |
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42 | my $status = $w->rstatus; |
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43 | }; |
10 | |
44 | |
11 | my $w = EV::timer 2, 0, sub { |
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12 | warn "is called after 2s"; |
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13 | }; |
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14 | |
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15 | my $w = EV::timer 2, 2, sub { |
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16 | warn "is called roughly every 2s (repeat = 2)"; |
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17 | }; |
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18 | |
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19 | undef $w; # destroy event watcher again |
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20 | |
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21 | my $w = EV::periodic 0, 60, 0, sub { |
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22 | warn "is called every minute, on the minute, exactly"; |
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23 | }; |
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24 | |
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25 | # IO |
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26 | |
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27 | my $w = EV::io *STDIN, EV::READ, sub { |
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28 | my ($w, $revents) = @_; # all callbacks receive the watcher and event mask |
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29 | warn "stdin is readable, you entered: ", <STDIN>; |
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30 | }; |
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31 | |
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32 | # SIGNALS |
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33 | |
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34 | my $w = EV::signal 'QUIT', sub { |
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35 | warn "sigquit received\n"; |
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36 | }; |
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37 | |
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38 | # CHILD/PID STATUS CHANGES |
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39 | |
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40 | my $w = EV::child 666, sub { |
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41 | my ($w, $revents) = @_; |
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42 | my $status = $w->rstatus; |
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43 | }; |
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44 | |
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45 | # STAT CHANGES |
45 | # STAT CHANGES |
46 | my $w = EV::stat "/etc/passwd", 10, sub { |
46 | my $w = EV::stat "/etc/passwd", 10, sub { |
47 | my ($w, $revents) = @_; |
47 | my ($w, $revents) = @_; |
48 | warn $w->path, " has changed somehow.\n"; |
48 | warn $w->path, " has changed somehow.\n"; |
49 | }; |
49 | }; |
50 | |
50 | |
51 | # MAINLOOP |
51 | # MAINLOOP |
52 | EV::loop; # loop until EV::unloop is called or all watchers stop |
52 | EV::loop; # loop until EV::unloop is called or all watchers stop |
53 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
53 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
54 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
54 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
55 | |
55 | |
56 | =head1 DESCRIPTION |
56 | =head1 DESCRIPTION |
57 | |
57 | |
58 | This module provides an interface to libev |
58 | This module provides an interface to libev |
59 | (L<http://software.schmorp.de/pkg/libev.html>). While the documentation |
59 | (L<http://software.schmorp.de/pkg/libev.html>). While the documentation |
60 | below is comprehensive, one might also consult the documentation of libev |
60 | below is comprehensive, one might also consult the documentation of |
61 | itself (L<http://cvs.schmorp.de/libev/ev.html>) for more subtle details on |
61 | libev itself (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod> or |
62 | watcher semantics or some discussion on the available backends, or how to |
62 | F<perldoc EV::libev>) for more subtle details on watcher semantics or some |
63 | force a specific backend with C<LIBEV_FLAGS>, or just about in any case |
63 | discussion on the available backends, or how to force a specific backend |
64 | because it has much more detailed information. |
64 | with C<LIBEV_FLAGS>, or just about in any case because it has much more |
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65 | detailed information. |
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66 | |
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67 | This module is very fast and scalable. It is actually so fast that you |
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68 | can use it through the L<AnyEvent> module, stay portable to other event |
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69 | loops (if you don't rely on any watcher types not available through it) |
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70 | and still be faster than with any other event loop currently supported in |
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71 | Perl. |
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72 | |
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73 | =head2 MODULE EXPORTS |
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74 | |
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75 | This module does not export any symbols. |
65 | |
76 | |
66 | =cut |
77 | =cut |
67 | |
78 | |
68 | package EV; |
79 | package EV; |
69 | |
80 | |
70 | use strict; |
81 | use common::sense; |
71 | |
82 | |
72 | BEGIN { |
83 | BEGIN { |
73 | our $VERSION = '2.0'; |
84 | our $VERSION = '3.7'; |
74 | use XSLoader; |
85 | use XSLoader; |
75 | XSLoader::load "EV", $VERSION; |
86 | XSLoader::load "EV", $VERSION; |
76 | } |
87 | } |
77 | |
88 | |
78 | @EV::IO::ISA = |
89 | @EV::IO::ISA = |
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84 | @EV::Idle::ISA = |
95 | @EV::Idle::ISA = |
85 | @EV::Prepare::ISA = |
96 | @EV::Prepare::ISA = |
86 | @EV::Check::ISA = |
97 | @EV::Check::ISA = |
87 | @EV::Embed::ISA = |
98 | @EV::Embed::ISA = |
88 | @EV::Fork::ISA = |
99 | @EV::Fork::ISA = |
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100 | @EV::Async::ISA = |
89 | "EV::Watcher"; |
101 | "EV::Watcher"; |
90 | |
102 | |
91 | @EV::Loop::Default::ISA = "EV::Loop"; |
103 | @EV::Loop::Default::ISA = "EV::Loop"; |
92 | |
104 | |
93 | =head1 EVENT LOOPS |
105 | =head1 EVENT LOOPS |
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104 | default loop as this is fastest (perl-wise), best supported by other |
116 | default loop as this is fastest (perl-wise), best supported by other |
105 | modules (e.g. AnyEvent or Coro) and most portable event loop. |
117 | modules (e.g. AnyEvent or Coro) and most portable event loop. |
106 | |
118 | |
107 | For specific programs you can create additional event loops dynamically. |
119 | For specific programs you can create additional event loops dynamically. |
108 | |
120 | |
109 | =over 4 |
121 | If you want to take advantage of kqueue (which often works properly for |
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122 | sockets only) even though the default loop doesn't enable it, you can |
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123 | I<embed> a kqueue loop into the default loop: running the default loop |
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124 | will then also service the kqueue loop to some extent. See the example in |
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125 | the section about embed watchers for an example on how to achieve that. |
110 | |
126 | |
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127 | =over 4 |
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128 | |
111 | =item $loop = new EV::loop [$flags] |
129 | =item $loop = new EV::Loop [$flags] |
112 | |
130 | |
113 | Create a new event loop as per the specified flags. Please refer to the |
131 | Create a new event loop as per the specified flags. Please refer to |
114 | C<ev_loop_new ()> function description in the libev documentation |
132 | the C<ev_loop_new ()> function description in the libev documentation |
115 | (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTIONS>) |
133 | (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTIONS>, |
116 | for more info. |
134 | or locally-installed as F<EV::libev> manpage) for more info. |
117 | |
135 | |
118 | The loop will automatically be destroyed when it is no longer referenced |
136 | The loop will automatically be destroyed when it is no longer referenced |
119 | by any watcher and the loop object goes out of scope. |
137 | by any watcher and the loop object goes out of scope. |
120 | |
138 | |
121 | Using C<EV::FLAG_FORKCHECK> is recommended, as only the default event loop |
139 | If you are not embedding the loop, then Using C<EV::FLAG_FORKCHECK> |
122 | is protected by this module. |
140 | is recommended, as only the default event loop is protected by this |
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141 | module. If you I<are> embedding this loop in the default loop, this is not |
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142 | necessary, as C<EV::embed> automatically does the right thing on fork. |
123 | |
143 | |
124 | =item $loop->loop_fork |
144 | =item $loop->loop_fork |
125 | |
145 | |
126 | Must be called after a fork in the child, before entering or continuing |
146 | Must be called after a fork in the child, before entering or continuing |
127 | the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls |
147 | the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls |
128 | this fucntion automatically, at some performance loss (refer to the libev |
148 | this function automatically, at some performance loss (refer to the libev |
129 | documentation). |
149 | documentation). |
130 | |
150 | |
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151 | =item $loop->loop_verify |
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152 | |
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153 | Calls C<ev_verify> to make internal consistency checks (for debugging |
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154 | libev) and abort the program if any data structures were found to be |
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155 | corrupted. |
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156 | |
131 | =item $loop = EV::default_loop [$flags] |
157 | =item $loop = EV::default_loop [$flags] |
132 | |
158 | |
133 | Return the default loop (which is a singleton object). |
159 | Return the default loop (which is a singleton object). Since this module |
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160 | already creates the default loop with default flags, specifying flags here |
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161 | will not have any effect unless you destroy the default loop first, which |
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162 | isn't supported. So in short: don't do it, and if you break it, you get to |
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163 | keep the pieces. |
134 | |
164 | |
135 | =back |
165 | =back |
136 | |
166 | |
137 | |
167 | |
138 | =head1 BASIC INTERFACE |
168 | =head1 BASIC INTERFACE |
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168 | =item $time = EV::now |
198 | =item $time = EV::now |
169 | |
199 | |
170 | =item $time = $loop->now |
200 | =item $time = $loop->now |
171 | |
201 | |
172 | Returns the time the last event loop iteration has been started. This |
202 | Returns the time the last event loop iteration has been started. This |
173 | is the time that (relative) timers are based on, and refering to it is |
203 | is the time that (relative) timers are based on, and referring to it is |
174 | usually faster then calling EV::time. |
204 | usually faster then calling EV::time. |
175 | |
205 | |
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206 | =item EV::now_update |
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207 | |
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208 | =item $loop->now_update |
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209 | |
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210 | Establishes the current time by querying the kernel, updating the time |
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211 | returned by C<EV::now> in the progress. This is a costly operation and |
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212 | is usually done automatically within C<EV::loop>. |
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213 | |
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214 | This function is rarely useful, but when some event callback runs for a |
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215 | very long time without entering the event loop, updating libev's idea of |
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216 | the current time is a good idea. |
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217 | |
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218 | =item EV::suspend |
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219 | |
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220 | =item $loop->suspend |
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221 | |
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222 | =item EV::resume |
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223 | |
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224 | =item $loop->resume |
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225 | |
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226 | These two functions suspend and resume a loop, for use when the loop is |
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227 | not used for a while and timeouts should not be processed. |
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228 | |
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229 | A typical use case would be an interactive program such as a game: When |
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230 | the user presses C<^Z> to suspend the game and resumes it an hour later it |
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231 | would be best to handle timeouts as if no time had actually passed while |
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232 | the program was suspended. This can be achieved by calling C<suspend> |
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233 | in your C<SIGTSTP> handler, sending yourself a C<SIGSTOP> and calling |
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234 | C<resume> directly afterwards to resume timer processing. |
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235 | |
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236 | Effectively, all C<timer> watchers will be delayed by the time spend |
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237 | between C<suspend> and C<resume>, and all C<periodic> watchers |
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238 | will be rescheduled (that is, they will lose any events that would have |
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239 | occured while suspended). |
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240 | |
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241 | After calling C<suspend> you B<must not> call I<any> function on the given |
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242 | loop other than C<resume>, and you B<must not> call C<resume> |
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243 | without a previous call to C<suspend>. |
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244 | |
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245 | Calling C<suspend>/C<resume> has the side effect of updating the event |
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246 | loop time (see C<now_update>). |
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247 | |
176 | =item $backend = EV::backend |
248 | =item $backend = EV::backend |
177 | |
249 | |
178 | =item $backend = $loop->backend |
250 | =item $backend = $loop->backend |
179 | |
251 | |
180 | Returns an integer describing the backend used by libev (EV::METHOD_SELECT |
252 | Returns an integer describing the backend used by libev (EV::BACKEND_SELECT |
181 | or EV::METHOD_EPOLL). |
253 | or EV::BACKEND_EPOLL). |
182 | |
254 | |
183 | =item EV::loop [$flags] |
255 | =item EV::loop [$flags] |
184 | |
256 | |
185 | =item $loop->loop ([$flags]) |
257 | =item $loop->loop ([$flags]) |
186 | |
258 | |
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206 | =item $count = EV::loop_count |
278 | =item $count = EV::loop_count |
207 | |
279 | |
208 | =item $count = $loop->loop_count |
280 | =item $count = $loop->loop_count |
209 | |
281 | |
210 | Return the number of times the event loop has polled for new |
282 | Return the number of times the event loop has polled for new |
211 | events. Sometiems useful as a generation counter. |
283 | events. Sometimes useful as a generation counter. |
212 | |
284 | |
213 | =item EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
285 | =item EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
214 | |
286 | |
215 | =item $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
287 | =item $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
216 | |
288 | |
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256 | |
328 | |
257 | =item $loop->set_timeout_collect_interval ($time) |
329 | =item $loop->set_timeout_collect_interval ($time) |
258 | |
330 | |
259 | These advanced functions set the minimum block interval when polling for I/O events and the minimum |
331 | These advanced functions set the minimum block interval when polling for I/O events and the minimum |
260 | wait interval for timer events. See the libev documentation at |
332 | wait interval for timer events. See the libev documentation at |
261 | L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP> for |
333 | L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP> |
262 | a more detailed discussion. |
334 | (locally installed as F<EV::libev>) for a more detailed discussion. |
263 | |
335 | |
264 | =back |
336 | =back |
265 | |
337 | |
266 | |
338 | |
267 | =head1 WATCHER OBJECTS |
339 | =head1 WATCHER OBJECTS |
268 | |
340 | |
269 | A watcher is an object that gets created to record your interest in some |
341 | A watcher is an object that gets created to record your interest in some |
270 | event. For instance, if you want to wait for STDIN to become readable, you |
342 | event. For instance, if you want to wait for STDIN to become readable, you |
271 | would create an EV::io watcher for that: |
343 | would create an EV::io watcher for that: |
272 | |
344 | |
273 | my $watcher = EV::io *STDIN, EV::READ, sub { |
345 | my $watcher = EV::io *STDIN, EV::READ, sub { |
274 | my ($watcher, $revents) = @_; |
346 | my ($watcher, $revents) = @_; |
275 | warn "yeah, STDIN should now be readable without blocking!\n" |
347 | warn "yeah, STDIN should now be readable without blocking!\n" |
276 | }; |
348 | }; |
277 | |
349 | |
278 | All watchers can be active (waiting for events) or inactive (paused). Only |
350 | All watchers can be active (waiting for events) or inactive (paused). Only |
279 | active watchers will have their callbacks invoked. All callbacks will be |
351 | active watchers will have their callbacks invoked. All callbacks will be |
280 | called with at least two arguments: the watcher and a bitmask of received |
352 | called with at least two arguments: the watcher and a bitmask of received |
281 | events. |
353 | events. |
282 | |
354 | |
283 | Each watcher type has its associated bit in revents, so you can use the |
355 | Each watcher type has its associated bit in revents, so you can use the |
284 | same callback for multiple watchers. The event mask is named after the |
356 | same callback for multiple watchers. The event mask is named after the |
285 | type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE, |
357 | type, i.e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE, |
286 | EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events |
358 | EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events |
287 | (which can set both EV::READ and EV::WRITE bits), and EV::timer (which |
359 | (which can set both EV::READ and EV::WRITE bits), and EV::timer (which |
288 | uses EV::TIMEOUT). |
360 | uses EV::TIMEOUT). |
289 | |
361 | |
290 | In the rare case where one wants to create a watcher but not start it at |
362 | In the rare case where one wants to create a watcher but not start it at |
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386 | because you happen to have this long-running UDP port watcher. |
458 | because you happen to have this long-running UDP port watcher. |
387 | |
459 | |
388 | In this case you can clear the keepalive status, which means that even |
460 | In this case you can clear the keepalive status, which means that even |
389 | though your watcher is active, it won't keep C<EV::loop> from returning. |
461 | though your watcher is active, it won't keep C<EV::loop> from returning. |
390 | |
462 | |
391 | The initial value for keepalive is true (enabled), and you cna change it |
463 | The initial value for keepalive is true (enabled), and you can change it |
392 | any time. |
464 | any time. |
393 | |
465 | |
394 | Example: Register an I/O watcher for some UDP socket but do not keep the |
466 | Example: Register an I/O watcher for some UDP socket but do not keep the |
395 | event loop from running just because of that watcher. |
467 | event loop from running just because of that watcher. |
396 | |
468 | |
397 | my $udp_socket = ... |
469 | my $udp_socket = ... |
398 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
470 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
399 | $1000udp_watcher->keepalive (0); |
471 | $udp_watcher->keepalive (0); |
400 | |
472 | |
401 | =item $loop = $w->loop |
473 | =item $loop = $w->loop |
402 | |
474 | |
403 | Return the loop that this watcher is attached to. |
475 | Return the loop that this watcher is attached to. |
404 | |
476 | |
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533 | This time simply fires at the wallclock time C<$at> and doesn't repeat. It |
605 | This time simply fires at the wallclock time C<$at> and doesn't repeat. It |
534 | will not adjust when a time jump occurs, that is, if it is to be run |
606 | will not adjust when a time jump occurs, that is, if it is to be run |
535 | at January 1st 2011 then it will run when the system time reaches or |
607 | at January 1st 2011 then it will run when the system time reaches or |
536 | surpasses this time. |
608 | surpasses this time. |
537 | |
609 | |
538 | =item * non-repeating interval timer ($interval > 0, $reschedule_cb = 0) |
610 | =item * repeating interval timer ($interval > 0, $reschedule_cb = 0) |
539 | |
611 | |
540 | In this mode the watcher will always be scheduled to time out at the |
612 | In this mode the watcher will always be scheduled to time out at the |
541 | next C<$at + N * $interval> time (for some integer N) and then repeat, |
613 | next C<$at + N * $interval> time (for some integer N) and then repeat, |
542 | regardless of any time jumps. |
614 | regardless of any time jumps. |
543 | |
615 | |
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561 | time the periodic watcher gets scheduled, the reschedule callback |
633 | time the periodic watcher gets scheduled, the reschedule callback |
562 | ($reschedule_cb) will be called with the watcher as first, and the current |
634 | ($reschedule_cb) will be called with the watcher as first, and the current |
563 | time as second argument. |
635 | time as second argument. |
564 | |
636 | |
565 | I<This callback MUST NOT stop or destroy this or any other periodic |
637 | I<This callback MUST NOT stop or destroy this or any other periodic |
566 | watcher, ever>. If you need to stop it, return 1e30 and stop it |
638 | watcher, ever, and MUST NOT call any event loop functions or methods>. If |
567 | afterwards. |
639 | you need to stop it, return 1e30 and stop it afterwards. You may create |
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640 | and start a C<EV::prepare> watcher for this task. |
568 | |
641 | |
569 | It must return the next time to trigger, based on the passed time value |
642 | It must return the next time to trigger, based on the passed time value |
570 | (that is, the lowest time value larger than to the second argument). It |
643 | (that is, the lowest time value larger than or equal to to the second |
571 | will usually be called just before the callback will be triggered, but |
644 | argument). It will usually be called just before the callback will be |
572 | might be called at other times, too. |
645 | triggered, but might be called at other times, too. |
573 | |
646 | |
574 | This can be used to create very complex timers, such as a timer that |
647 | This can be used to create very complex timers, such as a timer that |
575 | triggers on each midnight, local time (actually 24 hours after the last |
648 | triggers on each midnight, local time (actually 24 hours after the last |
576 | midnight, to keep the example simple. If you know a way to do it correctly |
649 | midnight, to keep the example simple. If you know a way to do it correctly |
577 | in about the same space (without requiring elaborate modules), drop me a |
650 | in about the same space (without requiring elaborate modules), drop me a |
… | |
… | |
644 | |
717 | |
645 | =head3 CHILD WATCHERS - watch out for process status changes |
718 | =head3 CHILD WATCHERS - watch out for process status changes |
646 | |
719 | |
647 | =over 4 |
720 | =over 4 |
648 | |
721 | |
649 | =item $w = EV::child $pid, $callback |
722 | =item $w = EV::child $pid, $trace, $callback |
650 | |
723 | |
651 | =item $w = EV::child_ns $pid, $callback |
724 | =item $w = EV::child_ns $pid, $trace, $callback |
652 | |
725 | |
653 | =item $w = $loop->child ($pid, $callback) |
726 | =item $w = $loop->child ($pid, $trace, $callback) |
654 | |
727 | |
655 | =item $w = $loop->child_ns ($pid, $callback) |
728 | =item $w = $loop->child_ns ($pid, $trace, $callback) |
656 | |
729 | |
657 | Call the callback when a status change for pid C<$pid> (or any pid if |
730 | Call the callback when a status change for pid C<$pid> (or any pid |
658 | C<$pid> is 0) has been received. More precisely: when the process receives |
731 | if C<$pid> is 0) has been received (a status change happens when the |
|
|
732 | process terminates or is killed, or, when trace is true, additionally when |
|
|
733 | it is stopped or continued). More precisely: when the process receives |
659 | a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all |
734 | a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all |
660 | changed/zombie children and call the callback. |
735 | changed/zombie children and call the callback. |
661 | |
736 | |
662 | It is valid (and fully supported) to install a child watcher after a child |
737 | It is valid (and fully supported) to install a child watcher after a child |
663 | has exited but before the event loop has started its next iteration (for |
738 | has exited but before the event loop has started its next iteration (for |
… | |
… | |
670 | You can have as many pid watchers per pid as you want, they will all be |
745 | You can have as many pid watchers per pid as you want, they will all be |
671 | called. |
746 | called. |
672 | |
747 | |
673 | The C<child_ns> variant doesn't start (activate) the newly created watcher. |
748 | The C<child_ns> variant doesn't start (activate) the newly created watcher. |
674 | |
749 | |
675 | =item $w->set ($pid) |
750 | =item $w->set ($pid, $trace) |
676 | |
751 | |
677 | Reconfigures the watcher, see the constructor above for details. Can be called at |
752 | Reconfigures the watcher, see the constructor above for details. Can be called at |
678 | any time. |
753 | any time. |
679 | |
754 | |
680 | =item $current_pid = $w->pid |
755 | =item $current_pid = $w->pid |
681 | |
|
|
682 | =item $old_pid = $w->pid ($new_pid) |
|
|
683 | |
756 | |
684 | Returns the previously set process id and optionally set a new one. |
757 | Returns the previously set process id and optionally set a new one. |
685 | |
758 | |
686 | =item $exit_status = $w->rstatus |
759 | =item $exit_status = $w->rstatus |
687 | |
760 | |
… | |
… | |
889 | # make the dispatcher handle any new stuff |
962 | # make the dispatcher handle any new stuff |
890 | ... not shown |
963 | ... not shown |
891 | }; |
964 | }; |
892 | |
965 | |
893 | The callbacks of the created watchers will not be called as the watchers |
966 | The callbacks of the created watchers will not be called as the watchers |
894 | are destroyed before this cna happen (remember EV::check gets called |
967 | are destroyed before this can happen (remember EV::check gets called |
895 | first). |
968 | first). |
896 | |
969 | |
897 | The C<check_ns> variant doesn't start (activate) the newly created watcher. |
970 | The C<check_ns> variant doesn't start (activate) the newly created watcher. |
898 | |
971 | |
899 | =back |
972 | =back |
… | |
… | |
930 | loop, other types of watchers might be handled in a delayed or incorrect |
1003 | loop, other types of watchers might be handled in a delayed or incorrect |
931 | fashion and must not be used). |
1004 | fashion and must not be used). |
932 | |
1005 | |
933 | See the libev documentation at |
1006 | See the libev documentation at |
934 | L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_> |
1007 | L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_> |
935 | for more details. |
1008 | (locally installed as F<EV::libev>) for more details. |
936 | |
1009 | |
937 | In short, this watcher is most useful on BSD systems without working |
1010 | In short, this watcher is most useful on BSD systems without working |
938 | kqueue to still be able to handle a large number of sockets: |
1011 | kqueue to still be able to handle a large number of sockets: |
939 | |
1012 | |
940 | my $socket_loop; |
1013 | my $socket_loop; |
941 | |
1014 | |
942 | # check wether we use SELECT or POLL _and_ KQUEUE is supported |
1015 | # check wether we use SELECT or POLL _and_ KQUEUE is supported |
943 | if ( |
1016 | if ( |
944 | (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) |
1017 | (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) |
945 | && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) |
1018 | && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) |
946 | ) { |
1019 | ) { |
947 | # use kqueue for sockets |
1020 | # use kqueue for sockets |
948 | $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; |
1021 | $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; |
949 | } |
1022 | } |
950 | |
1023 | |
951 | # use the default loop otherwise |
1024 | # use the default loop otherwise |
952 | $socket_loop ||= EV::default_loop; |
1025 | $socket_loop ||= EV::default_loop; |
953 | |
1026 | |
954 | =over 4 |
1027 | =over 4 |
955 | |
1028 | |
956 | =item $w = EV::embed $otherloop, $callback |
1029 | =item $w = EV::embed $otherloop[, $callback] |
957 | |
1030 | |
958 | =item $w = EV::embed_ns $otherloop, $callback |
1031 | =item $w = EV::embed_ns $otherloop[, $callback] |
959 | |
1032 | |
960 | =item $w = $loop->embed ($otherloop, $callback) |
1033 | =item $w = $loop->embed ($otherloop[, $callback]) |
961 | |
1034 | |
962 | =item $w = $loop->embed_ns ($otherloop, $callback) |
1035 | =item $w = $loop->embed_ns ($otherloop[, $callback]) |
963 | |
1036 | |
964 | Call the callback when the embedded event loop (C<$otherloop>) has any |
1037 | Call the callback when the embedded event loop (C<$otherloop>) has any |
965 | I/O activity. The C<$callback> should alwas be specified as C<undef> in |
1038 | I/O activity. The C<$callback> is optional: if it is missing, then the |
966 | this version of EV, which means the embedded event loop will be managed |
1039 | embedded event loop will be managed automatically (which is recommended), |
967 | automatically. |
1040 | otherwise you have to invoke C<sweep> yourself. |
968 | |
1041 | |
969 | The C<embed_ns> variant doesn't start (activate) the newly created watcher. |
1042 | The C<embed_ns> variant doesn't start (activate) the newly created watcher. |
|
|
1043 | |
|
|
1044 | =back |
|
|
1045 | |
|
|
1046 | =head3 ASYNC WATCHERS - how to wake up another event loop |
|
|
1047 | |
|
|
1048 | Async watchers are provided by EV, but have little use in perl directly, |
|
|
1049 | as perl neither supports threads running in parallel nor direct access to |
|
|
1050 | signal handlers or other contexts where they could be of value. |
|
|
1051 | |
|
|
1052 | It is, however, possible to use them from the XS level. |
|
|
1053 | |
|
|
1054 | Please see the libev documentation for further details. |
|
|
1055 | |
|
|
1056 | =over 4 |
|
|
1057 | |
|
|
1058 | =item $w = EV::async $callback |
|
|
1059 | |
|
|
1060 | =item $w = EV::async_ns $callback |
|
|
1061 | |
|
|
1062 | =item $w->send |
|
|
1063 | |
|
|
1064 | =item $bool = $w->async_pending |
970 | |
1065 | |
971 | =back |
1066 | =back |
972 | |
1067 | |
973 | |
1068 | |
974 | =head1 PERL SIGNALS |
1069 | =head1 PERL SIGNALS |
… | |
… | |
988 | my $async_check = EV::check sub { }; |
1083 | my $async_check = EV::check sub { }; |
989 | |
1084 | |
990 | This ensures that perl gets into control for a short time to handle any |
1085 | This ensures that perl gets into control for a short time to handle any |
991 | pending signals, and also ensures (slightly) slower overall operation. |
1086 | pending signals, and also ensures (slightly) slower overall operation. |
992 | |
1087 | |
993 | =head1 THREADS |
1088 | =head1 ITHREADS |
994 | |
1089 | |
995 | Threads are not supported by this module in any way. Perl pseudo-threads |
1090 | Ithreads are not supported by this module in any way. Perl pseudo-threads |
996 | is evil stuff and must die. As soon as Perl gains real threads I will work |
1091 | is evil stuff and must die. Real threads as provided by Coro are fully |
997 | on thread support for it. |
1092 | supported (and enhanced support is available via L<Coro::EV>). |
998 | |
1093 | |
999 | =head1 FORK |
1094 | =head1 FORK |
1000 | |
1095 | |
1001 | Most of the "improved" event delivering mechanisms of modern operating |
1096 | Most of the "improved" event delivering mechanisms of modern operating |
1002 | systems have quite a few problems with fork(2) (to put it bluntly: it is |
1097 | systems have quite a few problems with fork(2) (to put it bluntly: it is |
… | |
… | |
1026 | |
1121 | |
1027 | =head1 SEE ALSO |
1122 | =head1 SEE ALSO |
1028 | |
1123 | |
1029 | L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as |
1124 | L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as |
1030 | event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient |
1125 | event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient |
1031 | coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP). |
1126 | coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for |
|
|
1127 | event-loop agnostic and portable event driven programming. |
1032 | |
1128 | |
1033 | =head1 AUTHOR |
1129 | =head1 AUTHOR |
1034 | |
1130 | |
1035 | Marc Lehmann <schmorp@schmorp.de> |
1131 | Marc Lehmann <schmorp@schmorp.de> |
1036 | http://home.schmorp.de/ |
1132 | http://home.schmorp.de/ |
1037 | |
1133 | |
1038 | =cut |
1134 | =cut |
1039 | |
1135 | |